21440434404351 has 8 divisors (see below), whose sum is σ = 28587295631664. Its totient is φ = 14293598056640.

The previous prime is 21440434404341. The next prime is 21440434404421. The reversal of 21440434404351 is 15340443404412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21440434404351 - 2¹⁰ = 21440434403327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440434404341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4106526 + ... + 7729451.

It is an arithmetic number, because the mean of its divisors is an integer number (3573411953958).

Almost surely, 2^{21440434404351} is an apocalyptic number.

21440434404351 is a deficient number, since it is larger than the sum of its proper divisors (7146861227313).

21440434404351 is a wasteful number, since it uses less digits than its factorization.

21440434404351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12439801.

The product of its (nonzero) digits is 368640, while the sum is 39.

Adding to 21440434404351 its reverse (15340443404412), we get a palindrome (36780877808763).

The spelling of 21440434404351 in words is "twenty-one trillion, four hundred forty billion, four hundred thirty-four million, four hundred four thousand, three hundred fifty-one".